Method of making radiator-tubes.



No. 817,938. PATENTED APR. 17, 1906. F. H. STOLP & O. WRIGHT.

METHOD OF MAKING RADIATOR TUBES.

APPLIUATION FILED JUNE 27. 1904.

mamas. I A r IZZY/97%;};

WITED s'rA rns rrnnr errien.

ASSIGNORS TO LONG MANUFACTURING lLLlNOlS, A CORPORATION.

COMPANY, OF CHICAGO,

METHOD 'OF MAKBNG RADIATQR-TUBES.

Specification of Letters Patent.

Patented April 17, 1906;

Application filed rm 27.1904. Serial No. 214,374.

1'0 all whom tam/my concern:

Be it known that we, FRANK H. STOLP and CHRISTOPHER WRIGHT, citizens of the United States, residing at Chicago, in the county of Cook and State of- Illinois, have invented a certain new and useful Method of Making Radiator-Tubes, of which the following is a specification.

The resent invention relates to the method of ma ing radiatortubes having extended radiating surfaces, and more articularly that class of radiator-tubes in w 'ch the extended radiating-surfaces are provided b a strip or ribbon of sheet metal, preferably co per, which is disposed spirally about the tu e proper and has crimps or corrugations which gradually decrease in depth from the surface of the tube outward.

The improved method consists in forming in the strip of sheet metal which is to provide the extended radiating-surfaces a series oi transverse crimps or corrugations, which extend from edge to edge of the stri and are or practically uniform de th throng out. strip is then wound e gewise and in a spiral course around the 'tube proper, sufiicient tension being applied. to it during the winding process tov make its inner edge or the edge which contacts with the tubeconformthereto and hug it closely. lncidentall this stretches the corrugated strip, so that t ecorrugations are straightened out or elongated more or less. As the corrugated strip is being wound upon the tube a strip or strand of solder (preferably in the form of a round wire) is wound spirally around the tube between the convolutions oi the corrugated strip. Heat is then applied to melt the solder, 8. suitable flux having been previously applied to cause the solder when melted to flow into the joint between the inner edge of the corrugated strip and the outer surface of the tube. The flux is preferably applied to the strip before it is corrugated and preferably the strand of solder also is fluxed before it is wound upon the tube. The heat is preferably applied as the windin proceeds and not until several CODVOlIItlODSifiVG been wound. The advantage of this latter is that so long as This these several convolutions of the strand of solder remain intact they will hug the tube with sufficient friction to draw the strand asthe winding proceeds.

The resent application has nothing to do with t e machine by which the invention which forms its subject (the method) may be carried out; but for the purpose of illustrate ing the foregoing description this specification is accompanied by drawings which form a part hereof, and in which- Figures 1 and 2 are elevations of so much of a machine for carryin out the invention as is necessary to an un erstanding thereof, the parts in the two figures being viewed from positions ninety degrees removed from each other, respectively.

A. represents a spool or reel on which is wound the flat strip of sheet metal B, of which the extended radiating-surfaces are to be formed.

C is a-receptacle containing flux through which the strip B runs, suitable rollersc being provided for guiding the strip into and out oi the receptacle.

D represents a pair of rolls, having inter meshing flutes or corrugations, between which the strip B passes, whereby it is crimped or corrugated, as already described and as shown at b, said rolls being driven by any suitable means.

E represents guides between which the corrugated strip passes.

G is the tube onto which the corrugated stri is wound edgewise and in a s iral course,

is a s ool or reel on whic astrip or strand of so deih is wound.

i is a receptacle containing flux throu h which the strand of solder runs, suitable ro ls i being provided for. guiding the strand into and out of the receptacle.

plished by revolving the tube about its axis, I given the windingsiloy or i and the spiral courseils giving the tube an endwise movement.

a better description of a complete machine J is a gas-burner arranged beneath thereference is here made to our of even date herewith, bearing 214,375.

What we claim as new, and desire to secure by Letters Patent, is:

1. The method of making radiator-tubes having extended radiating-surfaces, whichconsists in forming transverse crinipsor cor application rugations in a strip of sheet metal that is to .solderin .the s irallywoun "provide the extended radiating-surfaces, winding the corrugated'strip.edgewise and in 2 5 aspiral course around the tube proper, mean- While applying tension thereto so as to more 50 strand of solder around the tube spirally and p or less straightenout or elongate-the corrugations and so as to make the nineredge of the corrugated stri conform ciosely to the surface of the-tube, an soldering the spirally-Wound strip to the tube, as the strip-is bein Wound upon the tube, substantially as described.

3. The method of making radiator-tubes having extended radiating-surfaces which consists in forming transverse crimps or corrugations in a strip of sheet metal that is to provide the extended radiatingsurfaces,

wi ndin the corrugated strip edgewise and in a spira course around the tube proper,fwindin a strand ofsolder around the tubes ira ly and between the convolutions of t e corru ated strip, and applyingheat to melt the so der, substantially as described.

4;"The method of making radiator-tubes having extended radiating surfages. which consists in forming transverse crini'ps or corrugations'in a strip of sheet metal'that is 'to' provide the extended radiating-surfaces, winding the stri .edgewise and in a spiral course around t .e; tube proper, Winding a erial- No. v

before win ing and applying heat to melt the gradually increasing having extended radiating-surfaces which Y amass between the convolutions of the corrugated strip, appl 'ng flux to the strip and strand solder after winding, substantially as described.

5. The method of making radiator-tubes having extended radiating-surfaces which consists in forming transverse crimps or corrugations in a strip of sheet metalthat is to provide the extended radiating-surfaces,

winding the corrugated strip edgewise and in a spiral course around the tube proper; meanwhile, applying tension thereto so as to more or less straighten out or elongate the 'corru ations to an extent radually increasing om the inner edge of the strip outward, winding a strand of solder around the tube spirally and betweenithe convolutions of the corrugatedstrip, and melting the solder after it is wound, the joint between the strip and tube having been previously fluxed, substantially as described.

6." The method of soldering a spiraljoint which consists in winding one part upon another to formthe joint, Winding a loose strand of solder. along or adjacent to the 'oint as it is formed and melting thesolder uring the process of windin to cause it to flow into the oint, substantial y as described.

7. The method of soldering which consists in winding one art upon another so that one contacts witht eother to form a joint, ap-

plying to the joint during the process'of wind Iparate body of-unfused solder, and 8 1 ing a se fusing t e solder after it is applied and during t e process of winding, substantially as described.

81 The method of making radiator-tubes v consists in disposing theiextended radiatingsurface s ira y upon the tube, winding-J a strand 0 solder spirally u on the tube etween the convolutions of t e extended radiatin surfaces, and appl 'ng heat to fuse the-9 soldgr, substantially as d dscribed.

'- FRANK H. STOLP.

@HRISTOPHER WRIGHT.

Witnesses:

BENJAMIN A1 WOLFE,

I M. HOPKINS. 

